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NO. 1 DAWSON: MARINE RED ALGAE OF PACIFIC MEXICO 15
Additional material: D. 496, Bahia Bocochibampo, Sonora,
Feb. Only carposporic plants present.
This species is similar both to Porphyra thuretii and to the Japanese
P. tenera, but is dioecious. From the several dioecious Japanese species it
differs in the number of carpospores and of spermatia. The prominently
ruffled and divided thallus and the light, dull color are also distinctive.
The plant was first recognized as an undescribed species by G. J. Hollenberg in July 1945.
Porphyra naiadum Anderson var. australis var. nov.
Plate 14, fig. 2
Ad forman typicam speciei, at sporis asexualibus tantum 4 in fasciculis singulis secundum formulam Jk 1 1 • sporis liberatis longitudine
^^^B. a b c
duplis quam latitudine.
Thalli epiphytic on Phyllospadix (or Zostera), usually 1-2 cm. tall,
purplish red in color, consisting of a few to many blades arising from a
small, hemispherical, multicellular base; blades broadly obovate, cuneate
to a stipe-like part at the base, monostromatic, 25-30 p thick in vegetative parts, of cells 8-10 p in diameter and 12-15 long (anticlinal dimension) ; chromatophore single, stellate; reproduction apparently only by
asexual spores, these at the margin of the thallus in adjoining packets of
four according to the formula -, |, -1 6-8 by 15-19 p in dimensions.
a b c
Type: Holotype is Dawson 216, Jan. 14, 1946, on sheet 4112 in
HAHF.
Type locality : On Phyllospadix, 8 km. south of Punta Descanso,
Baja California, Mexico.
Mexican distribution: Pacific Baja Calif.—Common on Phyllospadix torreyi and P. scouleri at virtually all peninsular and island
stations (except Isla Guadalupe) to as far south as Isla Magdalena, at
all seasons. In Bahia de San Quintin it occurs on Zostera marina as well
as on Phyllospadix.
Porphyra naiadum was described by Anderson (in Blankinship and
Keeler, 1892, p. 148) without designation of a type. He indicated that
the plant occurs both on Zostera and on Phyllospadix, but since only
Phyllospadix torreyi occurs at the Farallon Islands with which the 1892
report deals, it may be assumed that the epiphyte occurring on that plant
represents the type variety of the species. This variant was called by Hus
(1902) P. naiadum f. minor, and that growing on Zostera, P. naiadum
f. major. These may now be designated P. naiadum var. naiadum and P.
naiadum var. major Hus.

NO. 1 DAWSON: MARINE RED ALGAE OF PACIFIC MEXICO 15
Additional material: D. 496, Bahia Bocochibampo, Sonora,
Feb. Only carposporic plants present.
This species is similar both to Porphyra thuretii and to the Japanese
P. tenera, but is dioecious. From the several dioecious Japanese species it
differs in the number of carpospores and of spermatia. The prominently
ruffled and divided thallus and the light, dull color are also distinctive.
The plant was first recognized as an undescribed species by G. J. Hollenberg in July 1945.
Porphyra naiadum Anderson var. australis var. nov.
Plate 14, fig. 2
Ad forman typicam speciei, at sporis asexualibus tantum 4 in fasciculis singulis secundum formulam Jk 1 1 • sporis liberatis longitudine
^^^B. a b c
duplis quam latitudine.
Thalli epiphytic on Phyllospadix (or Zostera), usually 1-2 cm. tall,
purplish red in color, consisting of a few to many blades arising from a
small, hemispherical, multicellular base; blades broadly obovate, cuneate
to a stipe-like part at the base, monostromatic, 25-30 p thick in vegetative parts, of cells 8-10 p in diameter and 12-15 long (anticlinal dimension) ; chromatophore single, stellate; reproduction apparently only by
asexual spores, these at the margin of the thallus in adjoining packets of
four according to the formula -, |, -1 6-8 by 15-19 p in dimensions.
a b c
Type: Holotype is Dawson 216, Jan. 14, 1946, on sheet 4112 in
HAHF.
Type locality : On Phyllospadix, 8 km. south of Punta Descanso,
Baja California, Mexico.
Mexican distribution: Pacific Baja Calif.—Common on Phyllospadix torreyi and P. scouleri at virtually all peninsular and island
stations (except Isla Guadalupe) to as far south as Isla Magdalena, at
all seasons. In Bahia de San Quintin it occurs on Zostera marina as well
as on Phyllospadix.
Porphyra naiadum was described by Anderson (in Blankinship and
Keeler, 1892, p. 148) without designation of a type. He indicated that
the plant occurs both on Zostera and on Phyllospadix, but since only
Phyllospadix torreyi occurs at the Farallon Islands with which the 1892
report deals, it may be assumed that the epiphyte occurring on that plant
represents the type variety of the species. This variant was called by Hus
(1902) P. naiadum f. minor, and that growing on Zostera, P. naiadum
f. major. These may now be designated P. naiadum var. naiadum and P.
naiadum var. major Hus.